<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/my.css">
</head>
<body>
<div class="d1">A</div>
<div class="d2">B</div>
<div class="d3">C</div>



</body>
</html>